Deer Supply & Research MCP server

Which MCP servers are Deer Supply & Research's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-28

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Whose server it is

Registry namesupply.deer/deer-supplyverified in the MCP registry

The registry name sits under deer.supply. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-28

Stateanswerschecked 2026-10-28
Tools19
Server calls itselfdeer-supply
Server version2.1.0
Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 910 ms.

Should an agent connect itNot proven either way yet

Its tools do every use case we checked: compare semaglutide, tirzepatide and retatrutide trial numbers; estimate possible weight change with a projection calculator.
Checked on 5 of the 7 days it takes to judge reliability.

Once connected

For "compare semaglutide, tirzepatide and retatrutide trial numbers", the likely first call is compare_weight_loss_medications.
For "estimate possible weight change with a projection calculator", the likely first call is estimate_weight_loss.
set_health_emails change data without a sign-in: anyone with the address can call them.
Parameters are untyped or undescribed in 15 of 19 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 5, the first on 2026-10-28

INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
What an agent can do with it2 of 2 use cases
Answeredmeasuring5 of the 7 daily checks it takes to print a share
Median first answer1063 ms
Space in an agent's context≈ 2,301 tokensthe definitions of all its tools (19), which an agent carries on every turn
Tool definitionsB · 87 of 100
Typed results0 of 19 toolsdeclared outputSchema: results come typed, read once

Parameters without a description: in 15 of 19

What an agent can do with it

can do · compare semaglutide, tirzepatide and retatrutide trial numbers
can do · estimate possible weight change with a projection calculator
not sure · buy ready-to-use prefilled injection pens shipped to Canada

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

Tools that change data, on a server that answers without a sign-in: set_health_emails

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers19 tools · read 2026-10-28

search_products
Search Deer Supply's catalog (Canada). Weight loss: Retatrutide, Tirzepatide and Semaglutide as pre-filled, ready-to-use pens; also recovery products and ancillary capsules. Returns each product with its sizes, today's price in CAD (sales…
get_product
Everything Deer Supply publishes about one product: what it is, sizes and prices, the published dosing schedule, what is in the box, lab (COA) reports, and the related FAQ answers. product_id comes from search_products (e.g. 'retatrutide').
compare_weight_loss_medications
Side-by-side comparison of the three GLP weight-loss medications Deer Supply sells (Semaglutide, Tirzepatide, Retatrutide): mechanism, generation, the landmark trial's average weight loss, maintenance dose, today's starting price and…
estimate_weight_loss
What the clinical trials averaged for someone at a given starting weight, per medication, at 6, 12 and 18 months, using the same curves as deer.supply/calculator. These are trial averages, not a prediction for any one person.
quote_cart
Price a cart exactly as Deer Supply's checkout would: line prices with any sale or quantity break, an optional coupon code, shipping and the total in CAD, plus a delivery estimate when a Canadian postal code is given. variant_id values…
create_cart_link
A deer.supply link that opens the cart with these items already in it, for the person to review and check out themselves (they enter their own delivery details and payment). Agents cannot place orders.
delivery_estimate
When an order placed now would ship and arrive, for a Canadian postal code, using the dates Deer quotes on its product pages (orders by noon Eastern ship that weekday; pens travel on the fastest service).
get_help
Answers from Deer Supply's FAQ (shipping, storage, payment, using the pens, eligibility, returns) plus links to its policies. Pass the question; leave it empty for the whole FAQ.
get_store_info
Who Deer Supply is and how buying works: what it sells, where it ships, payment methods accepted right now, shipping costs, the money-back policy, lab testing, and how to reach a person.
get_lab_results
Third-party lab (COA) reports Deer Supply publishes per product size. Optional product_id.
track_order
Status of a Deer Supply order, given its order number AND the email it was placed with (the same check as deer.supply/track). Returns the status, dates, items and tracking number. Never returns addresses or payment details.
get_my_account
Requires signing in with a Deer account. A plain-language summary of the signed-in customer's Deer account: their name, orders with status and tracking, store credit and rewards, and (when health access was granted) each health profile's…
list_my_orders
Requires signing in with a Deer account. The signed-in customer's orders, newest first: number, date, status, total, items, tracking number and expected arrival.
get_my_health
Requires signing in with a Deer account. Each health profile on the account (one sign-in can chart several people): its id (needed to log anything), recent weigh-ins in pounds and the trend, the treatment plan (medication, week, current…
log_weight
Requires signing in with a Deer account. Record a weigh-in on one of the customer's health profiles. Confirm the number with the person first.
import_weights
Requires signing in with a Deer account. Add many past weigh-ins at once (from a scale app, a spreadsheet, a photo the person shared). Days already logged are skipped. Show the person the list and get their OK first.
report_side_effect
Requires signing in with a Deer account. Send a side effect to the customer's care team on one profile. If it sounds severe, tell the person to get medical help right away (call 911 or go to an emergency department) as well; this report…
resolve_side_effect
Requires signing in with a Deer account. Mark one of the profile's open side effects as resolved (side_effect_id from get_my_health). Reopening one is the care team's job.
set_health_emails
Requires signing in with a Deer account. Turn a profile's weigh-in reminder emails and/or reorder alert emails on or off.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "deer-supply": {
      "type": "http",
      "url": "https://deer.supply/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http deer https://deer.supply/api/mcp

Add to Cursor Add to VS Code

claude.ai, ChatGPT and other clients: add https://deer.supply/api/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.